Hello Experts:
Above questions was re-uploaded since there is a new situation:

The usb drive as per windows after connecting to my usb socket shows that "new deivce is installed and can now be used". However, there is still no letter and that the drive is not showing in "Disk Management" but it is showing under Device Manager.

I really need help on this quickly on how to view my data on this external usb drive. Thanks.

The Samsung SSD 840 EVO and 840 EVO mSATA have a well-known problem with a drop in read performance. I first learned about this in an interesting thread here at Experts Exchange:
http://www.experts-exchange.com/Hardware/Storage/Hard_Drives/Q_2852…

This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting.
This w…